package cn.tedu.v3_1;

import java.io.*;
import java.net.*;
import java.util.*;

/**
 * 多人聊天室 Version 3.1
 * Server
 *
 */
public class Server {
    private ServerSocket serverSocket;

    //优化1：端口号提前声明：私有属性
    private static final int PORT=1234;

    private PrintWriter pw;
    private BufferedReader br;
    public Server() {
        try {
            serverSocket = new ServerSocket(PORT);
        } catch (BindException e){
            System.out.println("端口号已经被占用");
        } catch (IOException e){
            e.printStackTrace();
        }
    }

    public void start() {
        try {
            while(true) {
                System.out.println("等待客户端连接");
                  Socket  socket = serverSocket.accept();

                new Thread(new ClientHandler(socket)).start();
            }
        } catch (IOException e) {
            System.out.println("客户端连接失效");
        } finally {
            if (serverSocket!=null&&serverSocket.isClosed()){
                try {
                    serverSocket.close();
                } catch (IOException e) {
                    System.out.println("服务器关闭失败~~~");
                }
                System.out.println("服务器关闭成功~~~Over");
            }
        }
    }

    public static void main(String[] args)  {
        new Server().start();
    }
    //ClientHandler多线程类：控制客户端发来的通讯消息
    private class ClientHandler implements Runnable{
        private Socket socket;
        private String ip;
        //Server--ClientHandler类--输出 输入流关闭
        //server----start()---输入流和输出流关闭
        private PrintWriter pw;
        private BufferedReader br;

        public ClientHandler(Socket s) {
            //1.明确接入客户端 通讯类 Socket
            this.socket=s;
            //2.给明确接入客户端，IP地址
             ip=socket.getInetAddress().getHostAddress();
             //3.给明确接入客户端，读写功能
            try {
                br=new BufferedReader(new InputStreamReader(socket.getInputStream(), "UTF8"));
                pw=new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream(),"UTF8")),true);
            } catch (IOException e) {
                System.out.println("客户端断开连接");
            }
        }
        public void run() {
        try {
              new Thread(() -> {
                try {
                    String message;
                    while ((message = br.readLine()) != null) {
                        System.out.println("客户端说：" + message);
                        System.out.print("服务器端请输入：");
                    }
                } catch (IOException e) {
                    System.out.println("客户端发的消息断开了");
                }
            }).start();
            Scanner input = new Scanner(System.in);
            while (true) {
                System.out.println("服务器请输入");
                String sme = input.nextLine();
                pw.println("服务器端说" + sme);
            }
        }finally {
            if (pw!=null)
                pw.close();
            if (br!=null)
            try {
                    br.close();
            } catch (IOException e) {
                System.out.println("读入流断开连接");
            }

            if(socket!=null&&!socket.isClosed()){
                    System.out.println(ip+"一个客户端退出服务器连接~~");
                    try {
                        socket.close();
                    } catch (IOException e) {
                        System.out.println(ip+"一个客户端退出链接异常~~");
                    }
                }
            }
        }
    }
}
